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# What is a change in velocity called?

**A change in velocity is called acceleration.** It can be positive or negative, though negative acceleration, or a decrease in velocity, is often referred to as deceleration.

Acceleration is the rate of change in velocity of an object over time. It is the net result of all the forces acting upon the object. The application of a physical force, such as hitting a ball with a bat, causes it to accelerate, as long as the force is sufficient to overcome the inertia of the object. A falling object accelerates at a constant rate due to the force of the Earth's gravity, until the force of gravity is matched by the force of air resistance. At that point, terminal velocity is reached. The object continues falling at a constant speed, and its acceleration is considered to be zero.

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Q:
## What is the free-fall equation?

A: The equation to calculate a free-falling object's velocity or time spent falling is velocity equals gravitational acceleration multiplied by time. This occ... Full Answer >Filed Under: -
Q:
## What is the formula for acceleration?

A: The formula for acceleration is given as a = (v2 - v1) / (t2 - t1), where "a" denotes the acceleration, "v2" indicates the final velocity, "v1" represents ... Full Answer >Filed Under: -
Q:
## How do you calculate the max height equation?

A: The maximum height of a projectile is calculated with the equation h = vy^2/2g, where g is the gravitational acceleration on Earth, 9.81 meters per second,... Full Answer >Filed Under: -
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## When velocity is positive and acceleration is zero, what happens to an object's motion?

A: When the acceleration of an object is zero and the velocity is positive, the object continues to move at a steady velocity in the same direction. The objec... Full Answer >Filed Under: